Synchrony Financial Credit Card Complaint

Synchrony Financial Credit card department,

Credit line increase/decrease California

I have a care credit card from syncrony bank, when i firs received the card i was approved for $1100.00 credit limt, it was offered at americas tires to me when i bought my tires in 2015 Shortly after getting approved and having the balance of my tires on the card, i get a letter saying my credit limit has been increased to $2100.00, didnt think much of it. I paid off the entire balance within the promotion period, they gave me. Ive used the Card a few times and paid it off.. well today i went to get tires for my car, and thought what the heck ill use my americas tire card, my balance for the tires was $630.00 the. Cashier told me my card was denied, we called syncrony and they said i only had a $500.00 avaliable balance. I never received any notice of any sort from them. If i would of know i could of saved the embarressmsnt i encountered. This will hurt my credit score and will damage me for a long time. I would like to have my card closed and any records from them removed, from my credit file. This is the only way there fraud like actions could be reversed. Right now i owe them $0.00 and will not use this card ever again. Im sure there are alot of American who they have done this to.